/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/**
 * @filename: int.cc
 */

#include <server_includes.h>
#include CSTDINT_H
#include <item/int.h>

/**
  Create an item from a string we KNOW points to a valid int64_t
  end \\0 terminated number string.
  This is always 'signed'. Unsigned values are created with Item_uint()
*/

Item_int::Item_int(const char *str_arg, uint32_t length)
{
  char *end_ptr= (char*) str_arg + length;
  int error;
  value= clpsar_strtoll10(str_arg, &end_ptr, &error);
  max_length= (uint32_t) (end_ptr - str_arg);
  name  =   (char*) str_arg;
  fixed = 1;
}

my_decimal *Item_int::val_decimal(my_decimal *decimal_value)
{
  int2my_decimal(E_DEC_FATAL_ERROR, value, unsigned_flag, decimal_value);
  return decimal_value;
}

String *Item_int::val_str(String *str)
{
  // following assert is redundant, because fixed=1 assigned in constructor
  assert(fixed == 1);
  str->set(value, &my_charset_bin);
  return str;
}

void Item_int::print(String *str, enum_query_type)
{
  // my_charset_bin is good enough for numbers
  str_value.set(value, &my_charset_bin);
  str->append(str_value);
}

int Item_int::save_in_field(Field *field, bool)
{
  int64_t nr=val_int();
  if (null_value)
    return set_field_to_null(field);
  field->set_notnull();
  return field->store(nr, unsigned_flag);
}

bool Item_int::eq(const Item *arg, bool) const
{
  /* No need to check for null value as basic constant can't be NULL */
  if (arg->basic_const_item() && arg->type() == type())
  {
    /*
      We need to cast off const to call val_int(). This should be OK for
      a basic constant.
    */
    Item *item= (Item*) arg;
    return item->val_int() == value && item->unsigned_flag == unsigned_flag;
  }
  return false;
}



